Short-Circuit Fault Tolerant Control of a Wind Turbine Driven Induction Generator Based on Sliding Mode Observers

A reference of the reactive power is imposed to zero (Qg* = 0) (A unity power factor). [...]the references of the active and reactivepowers provide then the reference currents igd*and igq*. {ig d∗=Pg∗vg d+Qg∗vg qvg d2+vg q2=Pg∗vgig q∗=Pg∗vg q−Qg∗vg dvg d2+vg q2=0 The grid control scheme based on active-reactive power regulation ensures the adjustment of DC bus voltage and generate the reference voltage vgabc*. Since this paper deals with ITSC fault, it is important to examine the time variant of the wind turbine system under reactance variations of the stator and rotor phases. Furthermore, to be close to real situations in wind farms, the developed FTC approach is studied under ITSC fault conditions when the wind speed increases suddenly. [...]Figure 12 and Figure 13 present the simulation result of the developed FTC-Performance of the wind turbine system driven IG with ITSC fault of 30% of s1-phase under 50% increase in both stator and rotor resistance values at t = 1.5 s and then under a sudden wind speed variation at t = 2.6 s. Figure 12 presents the variation along time of the wind speed V and the mechanical speed ωmec and its reference ωmec*. [...]the stability of the power supplied to the grid is disturbed which highlights the requirement of an efficient fault detection and isolation scheme and an active fault tolerant control technique to minimize the risk of damage to the generator and stator-side converter.